Weak Localization Coexisting with a Magnetic Field in a Normal-Metal--Superconductor Microbridge

Details Weak Localization Coexisting with a Magnetic Field in a Normal-Metal--Superconductor Microbridge Weak Localization Coexisting with a Magnetic Field in a Normal-Metal--Superconductor Microbridge

1995-04-12

arxiv.org/abs/cond-mat/9504047v1

Phys.Rev.B 52 (1995) R3868

Physics

Condensed Matter

8 pages, REVTeX-3.0, 1 figure

Scientific paper

10.1103/PhysRevB.52.R3868

A random-matrix theory is presented which shows that breaking time-reversal symmetry by itself does {\em not} suppress the weak-localization correction to the conductance of a disordered metal wire attached to a superconductor. Suppression of weak localization requires applying a magnetic field as well as raising the voltage, to break both time-reversal symmetry and electron-hole degeneracy. A magnetic-field dependent contact resistance obscured this anomaly in previous numerical simulations.

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